Make changes to MBMS Streaming APIs per recommendations

* Rename MbmsStreamingManager -> MbmsStreamingSession
* MbmsStreamingSession now implements AutoClosable instead of using
dispose()
* No longer throw checked MbmsExceptions from any methods. All such
errors will be reported via the async callback.
* null arguments no longer accepted for Handlers
* Guarantee that no further callbacks will get enqueued after closing.

Test: run testapps
Bug: 30981736
Change-Id: I85e98850759c6c7fe7b883ffffa5b1f4e362770d